# Protractor

> Easily measure angles in your browser window.

Canonical page: [https://chrome-stats.com/d/protractor](https://chrome-stats.com/d/protractor)

## Overview

- **ID:** `protractor`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** gcl
- **Category:** other
- **Daily users:** 370
- **Weekly downloads:** 11
- **Rating:** 4.75 / 5 (4 ratings)
- **Version:** 4.0.1
- **Last updated:** 2025-04-18
- **First published:** 2025-04-15
- **Size:** 77 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/protractor/)
- **Website:** [https://github.com/ghmon/protractor](https://github.com/ghmon/protractor)

## Description

Measure angles in the browser.

<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/2caa9ffd05e7dc2899e02ca2b00f0ef4a55369ec97f438f4479a9983044a04ef/https%3A//github.com/ben-burlingham/protractor" rel="nofollow">Original code by Ben Burlingham</a> for Google Chrome, some minor adjustments to <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c345c38b2e8583e3cbbba9834b5f2d1ad5683965062747ebfa6f22266b3c2ae8/https%3A//github.com/ghmon/protractor" rel="nofollow">make the code run with Firefox</a>. All credits to Ben Burlingham.

<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/18ae0d316ed63fa6b84b2ec15a75ac8fa41e174b8417c7a5a2bce9efa696d1c4/https%3A//chromewebstore.google.com/detail/protractor/kpjldaeddnfokhmgdlmpdlecmobaonnj" rel="nofollow">See usage description on the chrome extension site</a>.

After installation restart of Firefox might be needed cause of redraw remainders left of the welcome dialogue. This is not a fault in the original code, it occurs in the firefox adaption.

## Rankings

- #5,965 — Overall
- #100 — extract
- #137 — fact
- #142 — cause

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `scripting`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/protractor)